What is type erasure in Java?

What is type erasure in Java?

Type erasure is a process in Java generics where the compiler removes all type parameters during compilation, ensuring backward compatibility.

Why is type erasure important?

It's important because it allows Java to maintain compatibility with older versions that do not support generics, ensuring that generic code can run on legacy systems.

Can you give an example of type erasure?

Sure! For instance, if you have a generic class like List<T>, after type erasure, it becomes List and all type parameters are replaced with Object.

Does type erasure affect performance?

Generally, type erasure does not significantly affect performance, but it can lead to runtime type checks that may introduce overhead.

Are there any limitations due to type erasure?

Yes, one limitation is that you cannot use primitive types as type parameters, and you cannot create arrays of parameterized types.